I hope the labels can become transparent

[seggg]

when rendering window or glass, they can be more easily

[JeffM]

The labels support transparent images. Save out a tiff with transparency or png.

Is that what you're looking for?

[society]

How about a better way to locate them? Sometimes they are huge , or way off the model, but you can never see them.

[guest84672]

Simply click on position, then on the surface where you want to place them.